PFTrack 2011 Hide/Unhide user track

[malu05]

Sometimes during a user track i click hide at a wrong frame, but there is no "unhide" or "show" button anywhere.
Anyone know how to show/unhide a track at a certain frame?

[RobPhoboS]

Technically it's removing the keyframe when you click hide.
Really you need to think of that button as an on/off switch but once you've turned it off, you have to re-apply the keyframe yourself.